Experimental determination of the volumetric properties for the system CO₂-CH₄-N₂ at 100-1000 bars and 50-300°C

CO₂ CH₄, and N₂ are key volatile constituents of the earth; therefore, thermochemical data on these gas species and their mixtures find application in geochemical modeling of crustal fluids in a wide variety of geologic environments. However, volumetric data for gaseous mixtures are scarce, particularly at high pressures and temperatures. In this study, the volumetric properties of binary and ternary mixtures in the system CO₂-CH₄-N₂ were measured at 100-1000 bars, 50-300°C, using a vibrating-tube densimeter constructed at the Oak Ridge National Laboratory. An isobaric, isothermal flow-through method was employed to obtain a statistically significant number of measurements for the period of vibration at each set of P-T-X conditions. During each experimental session, three well Characterized standard gases (He, N₂ and Ar) were used to calibrate the response of the instrument. Precisions achieved in experimentation were: P, ±0.1 bar; and T, ±0.01 °C. Conservative estimates of accuracy are: P, ±0.2 bar; and T, ±0.05 °C. The uncertainties associated with volumetric determinations derive from counting statistics and vary as a function of the density and composition of the gas mixture. Generally, the uncertainty in volume ranges from ±0.1 to ±0.3 %.

Name thesis:degree_name

Ph. D.

Level thesis:degree_level

doctoral

Discipline thesis:degree_discipline

Geological Sciences

Department dc:contributor.department

Geological Sciences

Grantor dc:publisher

Virginia Tech

Year dc:date.issued

1994

Author dc:creator

• Seitz, Jeffery Charles

Chair dc:contributor.committeechair

• Bodnar, Robert J.

Committee members dc:contributor.committeemember

• Blencoe, James G.
• Chou, I-Ming
• Hewitt, David A.
• Rimstidt, J. Donald

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en

Dc Identifier Other

etd-02012006-141737

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/37254